English Dictionary

vernal point

noun

The point on the ecliptic where the sun crosses from the southern celestial hemisphere to the northern, which occurs at the (northern) vernal equinox; less commonly, either this point or the opposite point of crossing from north to south.

The vernal point marks the beginning of spring.

意味（1）

The point on the ecliptic where the sun crosses from the southern celestial hemisphere to the northern, which occurs at the (northern) vernal equinox; less commonly, either this point or the opposite point of crossing from north to south.

In principle, the function is symmetrical with respect to the vernal points, the axes λ_H = 0° and λ_H = 180°.